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1. Elasmobranchii: Elasmobranchs lack swim bladders, and maintain buoyancy with oil that they store in their livers. Some deep sea sharks are targeted by fisheries for this liver oil, including the school, gulper and basking sharks (pictured). (Subclass of fishes) [100%] 2023-11-25 [Elasmobranchii] [Wenlock first appearances]...
2. Elasmobranchii: Elasmobranchii (/ɪˌlæzməˈbræŋkiaɪ/) is a subclass of Chondrichthyes or cartilaginous fish, including modern sharks (superorder Selachii), rays, skates, and sawfish (superorder Batoidea). Members of this subclass are characterised by having five to seven pairs of gill clefts opening individually to the exterior ... (Biology) [100%] 2024-07-30 [Elasmobranchii]